Hello Aspirant,

Don't worry even if you have only 1 year and if you utilize it properly then you can still crack JEE-Main and JEE-Advance with good score, So I am enlisting down some best books for preparation of JEE-Advance 2021 :-

@Physics

Concepts of Physics by H C Verma (Vol-1 and Vol-2)

Fundamentals of Physics by David Halliday/Resnick/Walker

IIT JEE Physics by Arihant (35 years Chapterwise Solved Papers 2013-1979)

@Mathematics

Objective Mathematics By R.D. Sharma

Plane Trigonometry and Coordinate Geometry (Two Books) by S.L Loney

Problems in Calculus Of One Variable by I.A.Maron

Integral Calculus for IIT-JEE by Amit M Agarwal (Arihant Publications)

A Text Book of Algebra For JEE Main & Advanced by Dr. SK Goyal (Arihant Publications)

@Chemistry

Physical Chemistry by OP Tandon

Modern Approach to Chemical Calculations by R.C. Mukherjee

Organic Chemistry by O.P. Tandon

Organic Chemistry by Paula Bruice Yurkanis

Organic Chemistry by Morrison & Boyd

Inorganic Chemistry by J.D Lee

Inorganic Chemistry by O P Tandon

If you are preparing for JEE-Advance then you can check out the link given below for best preparation tips :-

https://engineering.careers360.com/articles/jee-advanced-preparation-tips-physics-chemistry-and-mathematics

You can also check out the complete JEE-Advance 2021 syllabus from the link given below :-

https://engineering.careers360.com/articles/jee-advanced-syllabus

I hope this information helps you.

Good Luck!!